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Discussion Starter #1
Ok so I have a 2008 polaris outlaw 450 mxr that I snapped a rod on. I'm planning on doing the 540 big bore from thumper racing with trail ported heads and a bored and jetted carb with a 12.5/1 compression piston. The one thing that I just can't figure out is what cam I need to put in it. I was told that the stage 4 from thumper would be the best but I'm not sure and need some help with it.
 
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